Data Recovery Best Practices for a Failed NAS Promise Vess A8021 RAID Configuration

Has your NAS Promise Vess A8021 suddenly lost its network drive and you’re unsure what to do next? Did the RAID array collapse, making your files inaccessible? Is the device throwing errors during startup? Perhaps you accidentally rebuilt the RAID array or several hard drives failed at the same time?

Data Recovery Best Practices for a Failed NAS Promise Vess A8021 RAID Configuration
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Promise Vess A8021 NAS Data Recovery in 2025

In this step-by-step tutorial, we’ll show you how to rebuild your RAID and recover data from an Vess A8021. We’ll walk through the most common causes of failure and demonstrate proven methods to restore files from a lost or degraded RAID array.

Data Recovery Best Practices for a Failed NAS Promise Vess A8021 RAID Configuration

RAID Recovery™ 2.8
Recover data from damaged RAID arrays inaccessible from a computer.
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Why Regular Data Recovery Tools Can’t Restore Files from RAID

Conventional hard drives store user data by writing it sequentially across the disk surface, which means an entire file is typically located on a single drive. In contrast, when data is written to a RAID array, each file is split into multiple fragments. These fragments are then distributed and written in sequence across all the drives in the array. Depending on the configuration, fragment sizes can range from 2 KB to 2 MB, so every file is physically stored across several disks at once.

This approach significantly increases read and write performance — after all, writing two halves of a 1 GB file to two drives simultaneously is much faster than writing the full 1 GB to a single disk. However, this same mechanism makes file recovery far more complex.

Different RAID levels use different methods to distribute and protect data. On top of that, manufacturers like Promise often add their own proprietary structures and variations. As a result, data can be written to disks in many different formats, and each requires a specific approach during recovery.

Are there any specific factors to consider when choosing a NAS Promise Vess A8021 device to minimize data loss risks?

Yes, there are several factors to consider when choosing a NAS Promise Vess A8021 device to minimize data loss risks. Here are some important factors to consider:

  1. Redundancy: Look for a NAS device that offers redundancy features such as RAID (Redundant Array of Independent Disks) configurations. RAID can protect your data by distributing it across multiple drives, ensuring that even if one drive fails, your data remains accessible.
  2. Backup options: Consider a NAS device that provides built-in backup options. This could include features like scheduled backups, incremental backups, or the ability to sync your data with cloud storage services. Having regular backups will help minimize the risk of data loss.
  3. Scalability: Ensure that the NAS device can accommodate your current and future storage needs. If your data storage requirements increase over time, you should be able to easily expand the storage capacity of the NAS device without any data loss or disruption.
  4. Data protection features: Look for features like snapshotting, which allows you to take point-in-time copies of your data. Snapshots can be useful in case of accidental file deletions or data corruption, as they enable you to restore previous versions of your data.
  5. Power protection: Consider a NAS device that includes power protection features such as an uninterruptible power supply (UPS) or surge protection. Power outages or electrical surges can lead to data loss or corruption, so having these protections in place can help mitigate these risks.
  6. Data integrity checks: Choose a NAS device that performs regular data integrity checks to identify and correct any potential data errors or corruption. This can help prevent data loss due to undetected errors.
  7. Ease of management: Ensure that the NAS device has a user-friendly interface and management tools that allow you to easily monitor and manage your data. This includes features like email alerts for system health, disk status, or potential issues.

By considering these factors, you can minimize data loss risks and ensure the safety and accessibility of your data on a NAS Promise Vess A8021 device.

How to Remove Hard Disks from Your NAS and Connect Them to a PC

Although the NAS Vess A8021 can be accessed over the network, you still need to remove its hard disks and connect them directly to a Windows PC. Only then can the recovery software properly scan and analyze the drives. Follow these steps:

  1. Power off the NAS and disconnect it from the power source.

    WARNING! Before removing any drives, carefully read the device manual. Improper actions may damage both the NAS enclosure and the hard disks in the RAID array.

  2. Remove the hard disks one by one, gently sliding each drive out of its slot. Remember that hard disks are highly sensitive: any impact or drop can cause serious physical damage.

  3. Label each hard disk according to its position inside the NAS. The order of the drives is crucial for correct RAID reconstruction.

  4. Connect the drives to your computer. In this video, we explain which ports you can use to connect hard disks and what to do if your PC does not have enough free connectors.

    Go to view
    How to Order Remote Data Recovery

    How to Order Remote Data Recovery

Step-by-Step Data Recovery with Hetman RAID Recovery

Hetman Raid Recovery

This program restores data from damaged RAID arrays and is fully compatible with Promise Vess A8021. Each hard disk in the array contains technical metadata describing how files were written. When launched, Hetman RAID Recovery analyzes this metadata, automatically reconstructs the damaged array, and provides access to its contents. After that, you can browse the recovered disk and save your files. The program can also restore files that were accidentally deleted from the network drive.

Go to view
How to recover data from a Promise

How to recover data from a Promise

Vess A8021 has 2 HDD slots, and it supports the following array types:

  • RAID 0;
  • RAID 1;
  • JBOD;

NAS supports:

  • exFAT, VFAT, FAT 12 / 16 / 32;
  • NTFS / ReFS;
  • APFS / HFS+;
  • Ext2 / 3 / 4 / ReiserFS / XFS / UFS / ZFS / Btrfs;
  • VMFS / HikvisionFS;

How to Safely Recover Data from Disk Images

This utility allows you to create a complete copy of a disk and work with the disk image instead of the physical drive. This approach helps protect your data from:

  • Overwriting during the recovery process;
  • Additional data loss caused by bad sectors;
  • User errors.

To create a disk image, follow these steps:

  1. Ensure you have enough free space to store the image. Its size will typically match the size of the original disk.

  2. In the main window, select the target disk and choose Tools - Save Disk. You can also select multiple disks if needed.

  3. When the Image Creation Wizard opens, select whether you want to save the entire disk or only a specific region. Adjust the settings and click Next.

    Hetman RAID Recovery: Image Creation Wizard

  4. Choose the directory where the image will be saved. You may select any available disk connected to your PC or upload the image via FTP.

    Hetman RAID Recovery: Choose a disk or save the image via FTP

Where Are the User’s Files Actually Stored?

The Promise Vess A8021 network-attached storage keeps OS Linux operating system files on a separate RAID 1 (mirrored) array. Usually, all NAS systems create several volumes on every hard disk, and the first of them takes up to 2 Gb of space. This is where operating system files are stored. Other volumes are united into a RAID array where user’s data is written.

RAID Recovery Software: Detailed Comparison

Product Operating system RAID controller support Supported file systems Virtual RAID controller support Data recovery from damaged RAID File preview
Hetman RAID Recovery Windows, Linux, MacOS Yes, over 100 controllers FAT, exFAT, NTFS, ReFS, APFS, HFS+, Ext4, Ext3, Ext2, ReiserFS, Btrfs, VMFS, Hikvision, XFS, UFS, ZFS Yes Yes Yes
DiskInternals RAID Recovery Windows Yes, over 10 controllers FAT, NTFS, Ext2/3/4, HFS+ No Yes Yes
R-Studio Windows, Mac, Linux Yes, over 20 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes
UFS Explorer RAID Recovery Windows, Mac, Linux Yes, over 100 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes
EaseUS Data Recovery Windows Yes, over 20 controllers FAT, NTFS, Ext2/3/4, HFS+ No Yes Yes
ReclaiMe Free RAID Recovery Windows Yes, over 100 controllers FAT, NTFS, Ext2/3/4, HFS+ Yes Yes Yes

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Comments (3)

  • Hetman Software: Data Recovery
    Hetman Software: Data Recovery 9.08.2022 12:31 #
    If you want to ask a question about data recovery, from NAS Vess A8021, feel free to leave a comment!
    Reply
  • Horatio Upton
    Horatio Upton 7.09.2023 17:47 #
    Will data recovery from a NAS Promise Vess A8021 device affect the existing data?
    Reply
    • Hetman Software
      Hetman Software 7.09.2023 19:00 #

      Data recovery from a NAS (Network Attached Storage) device like the Promise Vess A8021 should not affect the existing data if done correctly. However, it is always recommended to take precautions and follow best practices to minimize the risk of data loss.

      Here are a few things to consider:

      1. Engage a professional: It is advisable to seek the help of a professional data recovery service provider who specializes in NAS devices. They have the expertise and tools to handle the recovery process without causing any harm to the existing data.
      2. Avoid DIY attempts: Trying to recover data yourself without proper knowledge and experience can potentially lead to further data loss or damage. It is best to leave it to professionals who have the necessary skills and resources.
      3. Isolate the device: Once you realize data loss has occurred, it is crucial to stop using the NAS device immediately. Continued usage or any modifications to the device can potentially overwrite or corrupt the existing data, making recovery more difficult.
      4. Create a backup: If possible, make a backup of the existing data before attempting any recovery. This ensures that even if something goes wrong during the recovery process, you still have a copy of your data.

      Remember, data recovery is a complex process, and there is always a small possibility of data loss or damage. Therefore, it is essential to choose a reputable and reliable data recovery service provider to minimize any potential risks.

      Reply
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Vladimir Artiukh

Author: Vladimir Artiukh, Technical Writer

Vladimir Artiukh is a technical writer for Hetman Software, as well as the voice and face of their English-speaking YouTube channel, Hetman Software: Data Recovery for Windows. He handles tutorials, how-tos, and detailed reviews on how the company’s tools work with all kinds of data storage devices.

Oleg Afonin

Editor: Oleg Afonin, Technical Writer

Oleg Afonin is an expert in mobile forensics, data recovery and computer systems. He often attends large data security conferences, and writes several blogs for such resources as xaker.ru, Elcomsoft and Habr. In addition to his online activities, Oleg’s articles are also published in professional magazines. Also, Oleg Afonin is the co-author of a well-known book, Mobile Forensics - Advanced Investigative Strategies.

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Questions and answers

  • What are the necessary steps to physically set up a NAS Promise Vess A8021 at home?

    Setting up a NAS Promise Vess A8021 at home involves several steps. Here is a general outline of the necessary steps:

    1. Unpack and inspect the NAS: Carefully unpack the NAS unit and inspect it for any physical damage during shipping. Ensure that all the necessary components are included.
    2. Choose a suitable location: Select an appropriate location for the NAS, preferably a cool and well-ventilated area. Ensure that there is enough space for the NAS and that it is close to a power outlet and network connection.
    3. Connect power and network cables: Connect the power cable to the NAS and plug it into a power outlet. Then, connect the network cable from your router or switch to the LAN port on the NAS.
    4. Insert hard drives: Open the NAS enclosure and insert the hard drives into the drive bays. Ensure that the drives are properly aligned and securely connected to the NAS.
    5. Configure RAID: Depending on your storage needs, you may need to configure RAID (Redundant Array of Independent Disks) on the NAS. This step may vary depending on the specific NAS model and software interface. Consult the NAS user manual for detailed instructions on RAID configuration.
    6. Power on the NAS: Press the power button to turn on the NAS. Wait for it to boot up and initialize the drives. This process may take a few minutes.
    7. Access the NAS interface: Once the NAS is powered on, you can access its web-based interface using a computer connected to the same network. Open a web browser and enter the NAS IP address or hostname to access the interface.
    8. Set up network settings: Configure the network settings of the NAS, including IP address, subnet mask, gateway, and DNS. These settings will determine how the NAS connects to your home network.
    9. Create user accounts and shares: Set up user accounts on the NAS and create shared folders or volumes. This will allow you to control access to the NAS and organize your data.
    10. Configure additional settings: Depending on your requirements, you may need to configure additional settings such as backup, remote access, or media streaming. Refer to the NAS user manual for guidance on these settings.
    11. Test and verify: After completing the initial setup, perform some basic tests to ensure that the NAS is functioning correctly. Copy some files to the NAS, access them from other devices, and check for any errors or issues.

    These steps provide a general overview of setting up a NAS Promise Vess A8021 at home. However, it's important to refer to the specific user manual and documentation provided by Promise Technology for detailed instructions and any specific requirements or recommendations for your particular NAS model.

  • How do you configure the network settings and connect the NAS Promise Vess A8021 to your home network?

    To configure the network settings and connect the NAS Promise Vess A8021 to your home network, you can follow these steps:

    1. Connect the NAS device to your home network using an Ethernet cable. Plug one end of the cable into the LAN port on the NAS device and the other end into an available LAN port on your router or switch.
    2. Power on the NAS device by plugging it into a power source and pressing the power button.
    3. Locate the IP address of the NAS device. This can usually be found in the device's user manual or by using a network scanning tool. Alternatively, you can check the DHCP client list on your router to find the NAS device's IP address.
    4. Open a web browser on a computer connected to the same network and enter the NAS device's IP address in the address bar.
    5. You will be prompted to enter the login credentials for the NAS device. Use the default username and password provided in the device's user manual or on its packaging. It is highly recommended to change the default password after logging in for security reasons.
    6. Once logged in, you will be presented with the NAS device's web-based management interface. Navigate to the network settings or network configuration section.
    7. In the network settings, you can configure the NAS device to obtain an IP address automatically (DHCP) or specify a static IP address. Choose the appropriate option based on your network setup.
    8. If using a static IP address, enter the desired IP address, subnet mask, default gateway, and DNS server addresses provided by your network administrator or ISP.
    9. Save the network settings and restart the NAS device for the changes to take effect.
    10. After the NAS device restarts, it should be connected to your home network. You can access it by entering its IP address in a file explorer or using dedicated software provided by Promise Technology.

    Note: The exact steps may vary slightly depending on the specific model and firmware version of the Promise Vess A8021 NAS device. It is recommended to consult the device's user manual or contact Promise Technology support for detailed instructions.

  • What software or applications are required to access and manage the NAS Promise Vess A8021, and how do you install and configure them?

    To access and manage the NAS Promise Vess A8021, you need to use the following software or applications:

    1. Web-based User Interface (UI): The NAS Promise Vess A8021 can be managed through a web-based UI. You can access it using a web browser such as Google Chrome, Mozilla Firefox, or Microsoft Edge.
    2. Promise Utility: The Promise Utility is a software tool provided by Promise Technology to manage and configure their storage devices. It allows you to discover and configure the NAS Promise Vess A8021 on your network.

    Here are the steps to install and configure the software:

    1. Connect the NAS Promise Vess A8021 to your network using an Ethernet cable.
    2. Power on the NAS and wait for it to boot up.
    3. On your computer, open a web browser and enter the IP address of the NAS in the address bar. The IP address can be obtained from your network administrator or by checking the DHCP client list on your router.
    4. The web-based UI login page will appear. Enter the default username and password provided by Promise Technology. If you don't have the default credentials, consult the user manual or contact Promise Technology support.
    5. Once logged in, you can access and manage the NAS through the web-based UI. From here, you can configure network settings, create storage volumes, set up user accounts, and perform various administrative tasks.
    6. To install the Promise Utility, visit the Promise Technology website and navigate to the support section. Search for the appropriate version of the Promise Utility for your operating system and download it.
    7. Run the downloaded installer and follow the on-screen instructions to install the Promise Utility on your computer.
    8. Launch the Promise Utility and it will search for the NAS on your network. Once discovered, you can connect to the NAS and perform advanced management tasks using the Promise Utility.

    Note: The exact steps may vary slightly depending on the specific version of the NAS Promise Vess A8021 and the software versions provided by Promise Technology. It's recommended to refer to the user manual or contact Promise Technology support for detailed instructions specific to your device.
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